Question about IDS events



I am seeing external IP addresses in few events on my internal IDS.
These are mostly port/network scan type events. I am wondering what
the reason is. Instead of the firewall address why am I seeing the
originating IP? Is this due to the nature of ICMP packets or does this
result from scans like Nmap?

Thanks for your responses.

Sample events:

TCP_Port_Scan Medium 80.67.72.208 10.113.128.50
TCP_Port_Scan Medium 80.67.72.208 10.113.128.50
TCP_Port_Scan Medium 80.67.72.208 10.113.128.50
TCP_Port_Scan Medium 80.67.72.208 10.119.0.50

--
KoolK3

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